Broaching and similar machine



2 Sheets-Sheet '1 J. MdKECHNIE BROACHI-NG AND SIMILAR MACHINE Filed May'20 1919 Aug. '7," 1923.

JM 03M, hm, 114% as 5M, Mk

Aug. 7, 1923. 1 43.899

J. MCKE HNIE BROACHING AND SIMILAR MACHINE Filed Ma 20. 1919 2Sheets-Sheet 2 Patented Aug, 7, lfi23 JAMES MCKECHNIE, OFBARROVI-IN-FURNESS, ENGLAND, ASSIGNOR TO VICKEBS LIMITED, OFWESTMINSTER, LONDON, ENGLAND. f

BROACHING AND SIMILAR MACHINE.

Application filed May 20,

To all whom it may concern."

Be it known that T, JAMns MoKnoHNIE, a subject of the King of GreatBritain, residing at Naval Construction Works, Barrow-in-Furness, in thecounty of Lancaster, England, have invented certain new and usefulImprovements in or Relating to Broaching and Similar Machines, of whichthe following is a specification.

This invention relates to broaching and similar machines of the kind inwhich the rate of feed of the tool or tools during the cutting operationand the return movement thereof are controlled through the medium of ascrew adapted to be traversed in 0pposite directions, the chief bjectbeing to obtain a more rapid and constant return movement of the saidscrew than heretofore. In connection with machines of the kind abovereferred to, therate of the return movement of the said screw hasheretofore been relatively slow by reason of all the members governingthe return movement being in operative and positive connection with theprime mechanism for controlling the cutting movement of the screw, withthe result that any variation of the cutting movement of the screwcorrespondingly affected the return movement thereof.

According to this invention, means are provided whereby the mechanismsfor obtaining the cutting and return movements of the screw are adaptedto serve as independent units of control, thus enabling the rate of thecutting movement of the screw to be varied as required and the returnmovement of the screw to be maintained at a constant rate in excess ofthat hitherto obtained, so that a considerable saving of time iseffected more particularly in such classes of work where a longtraverseof the screw and a very slow rate of feed during the cutting movementare required.

In order that the said invention may be clearly understood and readilycarried into effect the same will now be described more fully withreference to the accompanying drawing in which Figure 1 is alongitudinal sectional view of a portion of a breaching machineembodying the invention, Figure 2' 1919. Serial No, 298,424.

is a longitudinal sectional view of a form of change speed gear for usewith the breach ing machine, and Figure 3 is an end elevation of Figure2.

Referring to Figure 1, a denotes the aforesaid screw which is shownextending longitudinally through the ends of a box or casing 6 andengaged by a nut 0 adapted to be rotated in either direction. cl is aclutch element which is arranged in sliding feather-and-grooveconnection with said nut and is provided with a clutch face 6 which iscaused to engage a corresponding clutch face f on a spur wheel 9 mountedwithin the casing Z) on a hearing it, when it is desired to drive thesaid nut at the relatively slow speed in the direction for moving thescrew axially in the direction of the arrow 2' for effecting the cuttingoperation. The spur wheel 9 meshes with a pinion j on a drivenco'untershaft is extending into the casing Z), which serves as an oilbath for the said gearing, the said countershaft being provided with aconed or stepped belt pulley Z whereby the rate of the cutting movementof the screw may be varied in accordance with requirements, In order toobtain the quick return movement of the screw a in the direction of thearrow m, the nut c is driven in the opposite direction to that aforesaidby means of a sleeve n directly connected at its inner end thereto, thesaid sleeve being freely mounted relatively to the screw a and providedwith fast and loose belt pulleys 0 and g), respectively, arranged withina box or casing b secured to the aforesaid casing 79. As shown, the beltis adapted to be moved from the loose pulley to the fast pulley or viceversa by means of a belt shifter Q pivotally mounted on a bracket 7 onthe casing Z). The said belt shifter is provided with a pin .9 workingin a camshaped slot 25 formed at one end of a rocking member u mountedon the said bracket r and having an arm n connected to a commonactuating or control. rod to. The other end of the said rocking memberis provided with a cam face an adapted to operate upon a roller y at theupper end of a pivoted lever e for moving the sliding clutch element dagainst the action of a spring-pressed pin a operating upon the saidlever e and tending to maintain the said clutch element in engagementwith the clutch face on the spur Wheel 9 With this arrangement ofdevices, it will be seen that there is no liability of the clutchelement (Z and the sleeve n becoming operatively connected with thescrew a at the same time. It will thus be seen that whenthe nut 0 isdriven from the toothed gearing g, j the screw will be moved forward atthe relatively slow cutting speed and that when the said nut c is drivenby the sleeve on from the belt pulley 0 the screw will be moved in thereverse direction at a relatively high speed.

In Figures 2 and 3 which show the stepped or coned pulley Z of Figure 1re placed by a single belt pulley Z and a change speed gear, thespur-wheel g corresponds in function to the spunwheel g of Figure 1 andhas connected to it a toothed. ring 9 of somewhat smaller diameter.Meshing with the spur-wheel g is a pinion rigidly connected to two otherpinions g and g Meshing with the toothed ring 9' is a pinion g rigidlyconnected to two other pinions 9 and 9 The pinion g" is of smallerdiameter than the pinion g the pinion g is thesame diameter the pin ion9, and the pinion is the same diameter as the pinion 9 The two sets ofpinions (9", g and g and (g*, 1 and are mounted for independent rotationand are arranged in line' axially. The shaft 7a to which the pulley Z isconnected has slidably keyed thereto a sleeve Z4 formed with threepinions 0 76 71: of which the two outer ones 10 and k are of equaldiameter and the center one it is of larger diameter than the others.The sleeve is moved along the shaft 70 by suitable means includ ingachandle k and a rod 76 to which the handle is rotatably connected. Thishandle hasaprojection 76 (Figure 3) which works in a slot]fl in a frame70 and which is adapted to be engaged, by angular movement of thehandle, in one or-other of four notches 1, 3, 4: and 5 corresponding toadjustments of-the sleeve 70 to give diflerent'speeds of the gear, or ina notch 2 corresponding to the neutral position of this gear] In theposition of the sleeve is shown in Figure 2, theprojection 70 isengaging in the notch 1 corresponding to the maximum cutting speed andthe pinion, 70 is meshing with the pinion 9 Movement of the rod 7ctowardsv the left first brings the pinion 70 out of mesh with the piniong and gives the neutral position determined by the notch 52, thenbringsthe pinion 0 into mesh with the pinion 9 to, give the secondhighest speed determined by the notch 3, thenbrings the pinion is? intomesh with the pinion 9'' to give the lowest speed determined by thenotch l and finally brings the pinion 70 into mesh with the pinion togive the second lowest speed determined by the notch 5.

What I claim and desire to secure by Letters Patent of the United Statesis 1. In a machine of the kind referred to, a tool actuating screw, arotatable nut in engagement with said screw, mechanism for driving saidnut in one direction to eifect the operative movement of the screw, aclutch device for at will connecting said mechanism to or disconnectingit from the nut, mechanism for driving the nut in the reverse directionto effect the return movement of the screw and means additional to saidclutch device for connecting the secondmentioned mechanism to the nutwhen the latter has been disconnected from the firstmentioned mechanism.2. Ina machine of the kind referred to a tool actuating screw, arotatable nut in engagement with said screw, mechanism for driving saidnut in one direction to effect the operative movement of the screw at arelatively slow speed, means forat will connecting said mechanism to ordisconnecting it from the nut, a belt pulley which is in constantoperative connection with said nut, a loose belt pulley, a beltengaging'with the latter pulley when said mechanism is connected to thenut and driving said loose pulley in the reverse directionv to, and at agreater speed than, the movement given to the other pulley by saidmechanism and means associated with the first-mentioned means forcausing said belt to be moved onto the first-mentioned pulley after saidmechanism has been disconnected from the nut and for returningthe beltto the loose pulley before said mechanism is again connected to the nut.

3. In a machine of the kind referred to,

a tool actuating screw, a, rotatable nut in engagement with said screw,mechanism for driving said nut in one direction to effect the operativemovement of the screw at a relatively slow speed, a sliding clutchelement for at will connecting said mecha nism to or disconnecting itfrom the nut, a belt pulley which is in constant operative connectionwith said nut, a loose belt pulley, a belt engaging with the latterpulley when said mechanism is connected to the nut and driving saidloose pulley in the reverse direction to, and at a greater speed thanthe movement given to the other pulley by said mechanism and meansassociated with the said slidingclutch element for causing said belt tobe moved on to the first-mentioned pulley after said mechanism has beendisconnected from the nut and forreturning the belt to the loose pulleybefore said mech anism is again connected to the nut.

4. In a machlne of the kind referred to, a tool actuating screw, arotatable nut in engagement with said screw, mechanism for rotating saidnut in one direction and 0btaining a relatively slow operative moveentof said screw, mechanism for rotating said nut in the opposite directionand obtaining a relatively quick return movement of said screw, saidmechanisms being adapted to be independently driven, a cam device,

means associated With said cam device and With said mechanism forenabling either of 10 said mechanisms to be brought into operation whenthe other is thrown out of action and an actuating member for saiddevice.

In testimony whereof I aflix my signature.

JAMES MOKEOHNIE.

